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lcd_hx8238a.c

/*
 * Freescale STMP37XX/STMP378X dotclk panel initialization
 *
 * Embedded Alley Solutions, Inc <source@embeddedalley.com>
 *
 * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/clk.h>

#include <mach/regs-lcdif.h>
#include <mach/regs-lradc.h>
#include <mach/regs-pinctrl.h>
#include <mach/regs-clkctrl.h>
#include <mach/regs-pwm.h>
#include <mach/regs-apbh.h>
#include <mach/gpio.h>
#include <mach/pins.h>
#include <mach/lcdif.h>
#include <mach/cpu.h>
#include <mach/stmp3xxx.h>

#include "common.h"

#define MAX_CHAIN_LEN         10

#define DOTCLK_H_ACTIVE  960
#define DOTCLK_H_PULSE_WIDTH 2
#define DOTCLK_HF_PORCH  1
#define DOTCLK_HB_PORCH  67
#define DOTCLK_H_WAIT_CNT  (DOTCLK_H_PULSE_WIDTH + (3 * DOTCLK_HB_PORCH))
#define DOTCLK_H_PERIOD (DOTCLK_H_WAIT_CNT + DOTCLK_HF_PORCH + DOTCLK_H_ACTIVE)

#define DOTCLK_V_PULSE_WIDTH  2
#define DOTCLK_V_ACTIVE  240
#define DOTCLK_VF_PORCH  1
#define DOTCLK_VB_PORCH  16
#define DOTCLK_V_WAIT_CNT (DOTCLK_V_PULSE_WIDTH + DOTCLK_VB_PORCH)
#define DOTCLK_V_PERIOD (DOTCLK_VF_PORCH + DOTCLK_V_ACTIVE + DOTCLK_V_WAIT_CNT)

static struct stmp3xxx_platform_bl_data bl_data;
extern struct pin_group lcd_pins;
extern unsigned lcd_spi_pins[];

static void spi_write(u32 val)
{
      u32 mask;

      gpio_set_value(lcd_spi_pins[SPI_MOSI], 0);
      gpio_set_value(lcd_spi_pins[SPI_SCLK], 0);
      gpio_set_value(lcd_spi_pins[SPI_CS], 0);

      for (mask = 0x00800000; mask != 0; mask >>= 1) {
            gpio_set_value(lcd_spi_pins[SPI_SCLK], 0);
            if (val & mask)
                  gpio_set_value(lcd_spi_pins[SPI_MOSI], 1);
            else
                  gpio_set_value(lcd_spi_pins[SPI_MOSI], 0);

            gpio_set_value(lcd_spi_pins[SPI_SCLK], 1);
      }

      udelay(10);
      gpio_set_value(lcd_spi_pins[SPI_MOSI], 0);
      gpio_set_value(lcd_spi_pins[SPI_SCLK], 0);
      gpio_set_value(lcd_spi_pins[SPI_CS], 1);
}

static void write_reg(u16 reg, u16 val)
{
      pr_debug("%s: writing %x to %x\n", __func__, reg, val);
      spi_write(0x00700000 | reg);
      spi_write(0x00720000 | val);
}

static void init_panel_hw(void)
{
      int i;
      const unsigned short seq[] = {
            0x02, 0x0200,
            0x03, 0x6164,
            0x0E, 0x3380,
            0x1E, 0x00D2,
            0x01, 0x733F,
            0x04, 0x0448,
            0x05, 0xBC54,
            0x0A, 0x4008,
            0x0B, 0xD400,
            0x0D, 0x3229,
            0x0F, 0x0000,
            0x30, 0x0000,
            0x31, 0x0407,
            0x32, 0x0202,
            0x33, 0x0000,
            0x34, 0x0505,
            0x35, 0x0003,
            0x36, 0x0707,
            0x37, 0x0000,
            0x3A, 0x0904,
            0x3B, 0x0904,
      };

      for (i = 0; i < sizeof(seq) / sizeof(seq[0]); i += 2)
            write_reg(seq[i], seq[i + 1]);
}

static int init_pinmux(void)
{
      return stmp3xxx_request_pin_group(&lcd_pins, "lcd_hx8238a");
}

static int init_pinmux_spi(void)
{
      int ret = -EINVAL;

      ret = gpio_request(lcd_spi_pins[SPI_MOSI], "lcd_hx8238a");
      if (ret)
            goto out_1;

      ret = gpio_request(lcd_spi_pins[SPI_SCLK], "lcd_hx8238a");
      if (ret)
            goto out_2;
      ret = gpio_request(lcd_spi_pins[SPI_CS], "lcd_hx8238a");
      if (ret)
            goto out_3;

      /* Enable these pins as outputs */
      gpio_direction_output(lcd_spi_pins[SPI_MOSI], 0);
      gpio_direction_output(lcd_spi_pins[SPI_SCLK], 0);
      gpio_direction_output(lcd_spi_pins[SPI_CS], 1);

      return 0;

out_3:
      gpio_free(lcd_spi_pins[SPI_SCLK]);
out_2:
      gpio_free(lcd_spi_pins[SPI_MOSI]);
out_1:
      return ret;
}

static void uninit_pinmux(void)
{
      stmp3xxx_release_pin_group(&lcd_pins, "lcd_hx8238a");
}

static void uninit_pinmux_spi(void)
{
      gpio_free(lcd_spi_pins[SPI_MOSI]);
      gpio_free(lcd_spi_pins[SPI_SCLK]);
      gpio_free(lcd_spi_pins[SPI_CS]);
}

static struct clk *lcd_clk;

static int init_panel(struct device *dev, dma_addr_t phys, int memsize,
            struct stmp3xxx_platform_fb_entry *pentry)
{
      int ret = 0;

      lcd_clk = clk_get(dev, "lcdif");
      if (IS_ERR(lcd_clk)) {
            ret = PTR_ERR(lcd_clk);
            goto out_1;
      }
      ret = clk_enable(lcd_clk);
      if (ret) {
            clk_put(lcd_clk);
            goto out_1;
      }
      ret = clk_set_rate(lcd_clk,
                  1000000/pentry->cycle_time_ns); /* kHz */
      if (ret) {
            clk_disable(lcd_clk);
            clk_put(lcd_clk);
            goto out_1;
      }

      ret = init_pinmux();
      if (ret)
            goto out_1;
      ret = init_pinmux_spi();
      if (ret)
            goto out_2;
      init_panel_hw();

      ret = stmp3xxx_lcdif_dma_init(dev, phys, memsize, 0);
      if (ret)
            goto out_3;

      setup_dotclk_panel(DOTCLK_V_PULSE_WIDTH, DOTCLK_V_PERIOD,
                  DOTCLK_V_WAIT_CNT, DOTCLK_V_ACTIVE,
                  DOTCLK_H_PULSE_WIDTH, DOTCLK_H_PERIOD,
                  DOTCLK_V_WAIT_CNT, DOTCLK_H_ACTIVE, 1);

      stmp3xxx_lcd_set_bl_pdata(pentry->bl_data);
      stmp3xxx_lcdif_notify_clients(STMP3XXX_LCDIF_PANEL_INIT, pentry);
      return 0;
out_3:
      uninit_pinmux_spi();
out_2:
      uninit_pinmux();
out_1:
      return ret;
}

static void release_panel(struct device *dev,
            struct stmp3xxx_platform_fb_entry *pentry)
{
      stmp3xxx_lcdif_notify_clients(STMP3XXX_LCDIF_PANEL_RELEASE, pentry);
      uninit_pinmux_spi();
      uninit_pinmux();
      release_dotclk_panel();
      stmp3xxx_lcdif_dma_release();
      clk_disable(lcd_clk);
      clk_put(lcd_clk);
}

static int blank_panel(int blank)
{
      int ret = 0;

      switch (blank) {
      case FB_BLANK_NORMAL:
      case FB_BLANK_VSYNC_SUSPEND:
      case FB_BLANK_HSYNC_SUSPEND:
      case FB_BLANK_POWERDOWN:
            stmp3xxx_clearl(BM_LCDIF_CTRL_RUN, REGS_LCDIF_BASE + HW_LCDIF_CTRL);
            break;

      case FB_BLANK_UNBLANK:
            stmp3xxx_setl(BM_LCDIF_CTRL_RUN, REGS_LCDIF_BASE + HW_LCDIF_CTRL);
            break;

      default:
            ret = -EINVAL;
      }
      return ret;
}

static struct stmp3xxx_platform_fb_entry fb_entry = {
      .name       = "hx8238a",
      .x_res            = 240,
      .y_res            = 320,
      .bpp        = 32,
      .cycle_time_ns    = 150,
      .lcd_type   = STMP3XXX_LCD_PANEL_DOTCLK,
      .init_panel = init_panel,
      .release_panel    = release_panel,
      .blank_panel      = blank_panel,
      .run_panel  = stmp3xxx_lcdif_run,
      .stop_panel = stmp3xxx_lcdif_stop,
      .pan_display      = stmp3xxx_lcdif_pan_display,
      .bl_data    = &bl_data,
};

static struct clk *pwm_clk;
static int init_bl(struct stmp3xxx_platform_bl_data *data)
{
      int ret = 0;

      pwm_clk = clk_get(NULL, "pwm");
      if (IS_ERR(pwm_clk)) {
            ret = PTR_ERR(pwm_clk);
            goto out;
      }
      clk_enable(pwm_clk);
      stmp3xxx_reset_block(REGS_PWM_BASE, 1);

      ret = stmp3xxx_request_pin(PINID_PWM2, PIN_FUN1, "lcd_hx8238a");
      if (ret)
            goto out_mux;
      stmp3xxx_pin_voltage(PINID_PWM2, PIN_12MA, "lcd_hx8238a");
      stmp3xxx_pin_strength(PINID_PWM2, PIN_3_3V, "lcd_hx8238a");

      stmp3xxx_clearl(BM_PWM_CTRL_PWM2_ENABLE, REGS_PWM_BASE + HW_PWM_CTRL);
      stmp3xxx_setl(BM_PWM_CTRL_PWM2_ANA_CTRL_ENABLE, REGS_PWM_BASE + HW_PWM_CTRL);
      __raw_writel(BF(10, PWM_ACTIVEn_INACTIVE) |
                        BF(5, PWM_ACTIVEn_ACTIVE),
                        REGS_PWM_BASE + HW_PWM_ACTIVEn(2));
      __raw_writel(BF(1, PWM_PERIODn_CDIV) | /* divide by 2 */
                  BF(2, PWM_PERIODn_INACTIVE_STATE) | /* low */
                  BF(3, PWM_PERIODn_ACTIVE_STATE) | /* high */
                  BF(14, PWM_PERIODn_PERIOD),
                  REGS_PWM_BASE + HW_PWM_PERIODn(2));
      return 0;

out_mux:
      clk_put(pwm_clk);
out:
      return ret;
}

static void free_bl(struct stmp3xxx_platform_bl_data *data)
{
      stmp3xxx_clearl(BM_PWM_CTRL_PWM2_ENABLE, REGS_PWM_BASE + HW_PWM_CTRL);
      stmp3xxx_release_pin(PINID_PWM2, "lcd_hx8238a");
      clk_disable(pwm_clk);
      clk_put(pwm_clk);
}

static void set_bl_intensity(struct stmp3xxx_platform_bl_data *data,
                  struct backlight_device *bd, int suspended)
{
      int intensity = bd->props.brightness;

      if (bd->props.power != FB_BLANK_UNBLANK)
            intensity = 0;
      if (bd->props.fb_blank != FB_BLANK_UNBLANK)
            intensity = 0;
      if (suspended)
            intensity = 0;

      stmp3xxx_clearl(BM_PWM_CTRL_PWM2_ENABLE, REGS_PWM_BASE + HW_PWM_CTRL);
      if (intensity) {
            HW_LRADC_CTRL2_CLR(BM_LRADC_CTRL2_BL_BRIGHTNESS);
            HW_LRADC_CTRL2_SET(BM_LRADC_CTRL2_BL_ENABLE |
                        BM_LRADC_CTRL2_BL_MUX_SELECT |
                        BF(intensity - 1, LRADC_CTRL2_BL_BRIGHTNESS));
            stmp3xxx_setl(BM_PWM_CTRL_PWM2_ENABLE, REGS_PWM_BASE + HW_PWM_CTRL);
      }
}

static struct stmp3xxx_platform_bl_data bl_data = {
      .bl_max_intensity = (BM_LRADC_CTRL2_BL_BRIGHTNESS >>
                              BP_LRADC_CTRL2_BL_BRIGHTNESS) + 1,
      .bl_default_intensity   = 0x10,
      .init_bl          = init_bl,
      .free_bl          = free_bl,
      .set_bl_intensity = set_bl_intensity,
};

static int __init register_devices(void)
{
      stmp3xxx_lcd_register_entry(&fb_entry,
                            stmp3xxx_framebuffer.dev.platform_data);
      return 0;
}
subsys_initcall(register_devices);

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